| 脉宽调制变量控制喷头雾化性能及风洞环境雾滴沉积特性 |
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| 引用本文： | 张瑞瑞,李龙龙,付旺,陈立平,伊铜川,唐青,Andrew J Hewitt.脉宽调制变量控制喷头雾化性能及风洞环境雾滴沉积特性[J].农业工程学报,2019,35(3):42-51. |
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| 作者姓名： | 张瑞瑞 李龙龙 付旺 陈立平 伊铜川 唐青 Andrew J Hewitt |
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| 作者单位： | 北京农业智能装备技术研究中心;国家农业智能装备工程技术研究中心;国家农业航空应用技术国际联合研究中心;西北农林科技大学机械与电子工程学院;昆士兰大学施药技术与安全研究中心 |
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| 基金项目： | 北京市科技新星计划项目（Z181100006218029）；国家自然科学基金项目（31601228）；北京市农林科学院2018创新能力建设专项（KJCX20180424）；国家重点研发计划—地面与航空高工效施药技术及智能化装备（/2016YFD0200701-2） |
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| 摘 要： | 脉宽调制(pulse width modulation, PWM)技术是实现变量喷雾的重要手段,其工作参数与环境条件决定着施药的精准性。为探究PWM变量喷头雾化及风洞环境沉积特性,该文研制了脉宽调制变量喷雾系统,以农业施药常用空心圆锥雾化喷头喷雾的雾化、沉积特性为研究对象,在IEA-II型常规风速风洞内,通过点阵式放置电容式雾滴沉积传感器测定计算雾滴沉积与沉积评价指数(deposition evaluation index,DEIX),并利用Spraytec雾滴粒径仪测试其雾滴体积中径(volume median diameter,VMD)和雾滴相对分布跨度(relative span,RS)。试验结果表明:占空比在10%～40%间,随占空比增大,雾滴体积中径呈减小趋势,与占空比10%时相比,占空比40%时的雾滴体积中径下降了7.9%;PWM占空比60%时分布跨度最小,较占空比20%时雾滴分布跨度下降9.52%,雾滴谱最窄,获得的雾滴粒径分布最集中。雾滴沉积方面,风速1 m/s条件下,雾滴主要沉积在距喷头3.3 m内,此范围内沉积量占总沉积量的95.7%,当风速超过3 m/s时,在气流作用下,雾滴沉降距离增大,导致雾滴运动偏离施药靶标区域。PWM占空比增加,雾滴沉积评价指数DEIX值降低,雾滴的飘移率增大;相同工况下,风速及喷头高度越大,DEIX越小,施药雾滴越易飘移。该研究可为农业田间实际生产中脉宽调制变量施药技术应用及其工况参数的选择提供依据,为PWM变量调节装置的进一步优化提供研究基础。
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| 关 键 词： | 脉宽调制 喷雾 试验 体积中径 雾滴沉积评价指数 风洞 |
| 收稿时间： | 2018/8/10 0:00:00 |
| 修稿时间： | 2019/1/9 0:00:00 |
Spraying atomization performance by pulse width modulated variable and droplet deposition characteristics in wind tunnel |
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| Zhang Ruirui,Li Longlong,Fu Wang,Chen Liping,Yi Tongchuan,Tang Qing and Andrew J Hewitt.Spraying atomization performance by pulse width modulated variable and droplet deposition characteristics in wind tunnel[J].Transactions of the Chinese Society of Agricultural Engineering,2019,35(3):42-51. |
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| Authors: | Zhang Ruirui Li Longlong Fu Wang Chen Liping Yi Tongchuan Tang Qing and Andrew J Hewitt |
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| Institution: | 1. Beijing Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 2. National Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 3. National Center for International Research on Agricultural Aerial Application Technology, Beijing 100097, China;,1. Beijing Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 2. National Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 3. National Center for International Research on Agricultural Aerial Application Technology, Beijing 100097, China;,2. National Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 3. National Center for International Research on Agricultural Aerial Application Technology, Beijing 100097, China; 4. College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling 712100, China;,1. Beijing Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 2. National Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 3. National Center for International Research on Agricultural Aerial Application Technology, Beijing 100097, China;,1. Beijing Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 2. National Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 3. National Center for International Research on Agricultural Aerial Application Technology, Beijing 100097, China;,1. Beijing Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 2. National Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China; 3. National Center for International Research on Agricultural Aerial Application Technology, Beijing 100097, China; and 5. Centre for Pesticide Application and Safety, University of Queensland, Queensland 4072, Australia |
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| Abstract: | |
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| Keywords: | pulse width modulation spraying experiments volume median diameter deposition evaluation index wind tunnel |
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